import { type UnitConversionProps } from "../Interfaces";
/**
 * Checks if two numbers are approximately equal within given relative tolerance.
 * @internal
 */
export declare function almostEqual(a: number, b: number, tolerance?: number): boolean;
/** Determines if a value is almost zero. (less than 1e-16)
 * @internal
 */
export declare function almostZero(value: number): boolean;
/** Shared numeric conversion implementation used by both legacy `applyConversion(...)` and safe public helpers.
 * The `failOnInvalidConversion` switch preserves legacy compatibility while letting newer APIs throw
 * when conversion metadata is explicitly marked invalid.
 * @internal
 */
export declare function applyConversionInternal(value: number, props: UnitConversionProps, failOnInvalidConversion: boolean): number;
/** Applies a unit conversion while throwing on invalid conversion metadata.
 * @internal
 */
export declare function convertValueOrThrow(value: number, conversion: UnitConversionProps): number;
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